Lipo question
11-19-2007 | 07:57 PM
#2
RE: Lipo question
Battery Capacity in Ah multiplied by the C rating.
Example: 2000mAh LiPo @ 20C
2000mAh = 2Ah
2Ah * 20 = 40
The LiPo would be able to provide 40A constant. What I do is then multiply this value by 80-85%, to be on the safe side. This would be about 35A of continuous discharge.
Ryan
Example: 2000mAh LiPo @ 20C
2000mAh = 2Ah
2Ah * 20 = 40
The LiPo would be able to provide 40A constant. What I do is then multiply this value by 80-85%, to be on the safe side. This would be about 35A of continuous discharge.
Ryan
01-31-2010 | 08:50 PM
#7
RE: Lipo question
here is my question, i have both 3700 mah 25 c 2s packs and 3200 mah 20 c packs, should i be seeing such a drastic difference between the two? When i had my jet boat set up i would run the 3700's just fine but then the 3200s i would always cut short because of one thing or another. I always charged them though even if i only used em for like 2 min, could that have affected them? When i checked the voltage on them after today's run it read 7.6 where as the 3700's read 6.8 but it seemed like the 3700s had more left at the end when i stopped it then the 3200s. I hooked up a brushed motor to one of the 3200s and when i put a load on the motor the voltage would drop quite a bit, about a full volt. Are my cells damaged somehow? anyway to re boost them or something of that sort? Also the 3200's seem to struggle lasting 5 min but the 3700's easily last 10 min plus. anybody have any ideas? oh yeah here is the link http://www.youtube.com/watch?v=Rvbd_DrABZM you should be able to get to the 4 videos i took today and see the one i took when i was using the 3200's that are in question. Posted this in the super tune you sv thread but no response so i'm trying again
02-01-2010 | 01:35 AM
#8
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From: Frederick, CO
RE: Lipo question
ORIGINAL: asupervee72
here is my question, i have both 3700 mah 25 c 2s packs and 3200 mah 20 c packs, should i be seeing such a drastic difference between the two? When i had my jet boat set up i would run the 3700's just fine but then the 3200s i would always cut short because of one thing or another. I always charged them though even if i only used em for like 2 min, could that have affected them? When i checked the voltage on them after today's run it read 7.6 where as the 3700's read 6.8 but it seemed like the 3700s had more left at the end when i stopped it then the 3200s. I hooked up a brushed motor to one of the 3200s and when i put a load on the motor the voltage would drop quite a bit, about a full volt. Are my cells damaged somehow? anyway to re boost them or something of that sort? Also the 3200's seem to struggle lasting 5 min but the 3700's easily last 10 min plus. anybody have any ideas? oh yeah here is the link http://www.youtube.com/watch?v=Rvbd_DrABZM you should be able to get to the 4 videos i took today and see the one i took when i was using the 3200's that are in question. Posted this in the super tune you sv thread but no response so i'm trying again
here is my question, i have both 3700 mah 25 c 2s packs and 3200 mah 20 c packs, should i be seeing such a drastic difference between the two? When i had my jet boat set up i would run the 3700's just fine but then the 3200s i would always cut short because of one thing or another. I always charged them though even if i only used em for like 2 min, could that have affected them? When i checked the voltage on them after today's run it read 7.6 where as the 3700's read 6.8 but it seemed like the 3700s had more left at the end when i stopped it then the 3200s. I hooked up a brushed motor to one of the 3200s and when i put a load on the motor the voltage would drop quite a bit, about a full volt. Are my cells damaged somehow? anyway to re boost them or something of that sort? Also the 3200's seem to struggle lasting 5 min but the 3700's easily last 10 min plus. anybody have any ideas? oh yeah here is the link http://www.youtube.com/watch?v=Rvbd_DrABZM you should be able to get to the 4 videos i took today and see the one i took when i was using the 3200's that are in question. Posted this in the super tune you sv thread but no response so i'm trying again
3700mah 25c packs = 92.5amps cont.
3200mah 20c packs = 64amps cont.
that's almost 30amps difference
02-01-2010 | 11:16 AM
#9
RE: Lipo question
i know there is a big amperage difference but i was thinking since the esc is only rated for 45 amps and it barely even gets warm both sets of batteries would supply enough amps to get pretty much the same speed but just a little shorter run time with the 3200s but they seem like they die in less then half the time of the 3700's. guess that's what i get for buying more expensive cells in usa, the cheap china ones out perform them for less coin
02-01-2010 | 12:28 PM
#10
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From: Frederick, CO
RE: Lipo question
the esc does not limit what the motor gets. [:-]
the motor will pull how many amps it needs at anytime, the esc supplies the volts and amps the motor needs from the batteries..
the motor will pull how many amps it needs at anytime, the esc supplies the volts and amps the motor needs from the batteries..
02-01-2010 | 06:45 PM
#12
RE: Lipo question
unfortunately i could not tell you that because the three dollar multimeter i got from harbor freight only reads up to 2000 mah and my charger is very basic and does not tell me any of that
02-08-2010 | 01:34 PM
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From: Ozarks, USA
RE: Lipo question
ORIGINAL: asupervee72
unfortunately i could not tell you that because the three dollar multimeter i got from harbor freight only reads up to 2000 mah and my charger is very basic and does not tell me any of that
unfortunately i could not tell you that because the three dollar multimeter i got from harbor freight only reads up to 2000 mah and my charger is very basic and does not tell me any of that
